package com.qk.filter;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;

//@WebFilter(urlPatterns = "/*")
@Slf4j
public class TokenFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1.获取请求路径
        String uri = request.getRequestURI();  //depts , /users , /login
        //2.判断是否是登录请求， 如果是，放行
        if (uri.contains("/login")){  //登录 ，放行
            log.info("登录请求: {},放行" ,uri);
            filterChain.doFilter(request, response);
            return;
        }

        //3.获取请求头 token
        String jwt = request.getHeader("token");
        //4.判断token是否存在，如果不存在，响应401状态码
        if (jwt == null || jwt.isEmpty()){
            log.info("请求头token不存在");
            response.setStatus(401);
            return;
        }

        //5.解析令牌，如果解析令牌报错，响应401状态码
        try {
            Claims claims = JwtUtils.parseToken(jwt);
            Integer userId = claims.get("id", Integer.class);
            log.info("当前用户ID,存入ThreadLocal");
            CurrentUserHoler.setCurrentUser(userId);
        }catch (Exception e){
            log.info("令牌解析失败");
            response.setStatus(401);
            return;
        }

        //6.放行
        log.info("放行");
        filterChain.doFilter(request, response);

        //7.释放资源
        log.info("删除ThreadLocal中的登录用户信息");
        CurrentUserHoler.removeCurrentUser();
    }
}
